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A1357 Datasheet(PDF) 9 Page - Allegro MicroSystems |
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A1357 Datasheet(HTML) 9 Page - Allegro MicroSystems |
9 / 20 page Two-Wire High Precision Linear Hall-Effect Sensor IC With Pulse Width Modulated Output Current A1357 9 Allegro MicroSystems, Inc. 115 Northeast Cutoff Worcester, Massachusetts 01615-0036 U.S.A. 1.508.853.5000; www.allegromicro.com For purposes of specification, the Sensitivity Drift Due to Pack- age Hysteresis, ∆SensPKG, is defined as: Sens(25°C)2 – Sens(25°C)1 Sens(25°C)1 ∆SensPKG = ×100% , (9) where Sens(25°C)1 is the programmed value of sensitivity at TA = 25°C, and Sens(25°C)2 is the value of sensitivity at TA = 25°C, after temperature cycling TA up to 150°C, down to –40°C, and back to up 25°C. Linearity Sensitivity Error The A1357 is designed to provide a linear current output in response to a ramping applied magnetic field. Consider two magnetic fields, B1 and B2. Ideally, the sen- sitivity of a device is the same for both fields, for a given supply voltage and temperature. Linearity error is present when there is a difference between the sensitivities measured at B1 and B2. Linearity Sensitivity Error is calculated separately for the positive (LinERRPOS) and negative (LinERRNEG ) applied magnetic fields. Linearity error (%) is measured and defined as: SensBPOS2 SensBPOS1 SensBNEG2 SensBNEG1 1– LinERRPOS = ×100% , 1– LinERRNEG = ×100% , (10) where: |D(Bx) – D(Q)| Bx SensBx = . (11) and BPOSx and BNEGx are positive and negative magnetic fields, with respect to the quiescent current duty cycle such that BPOS2 = 2 × BPOS1 and BNEG2 = 2 × BNEG1. Then: LinERR max(LinERRPOS, LinERRNEG) = . (12) Note that unipolar devices only have positive linearity error (LinERRPOS). Symmetry Sensitivity Error The magnetic sensitivity of the A1357 device is constant for any two applied magnetic fields of equal magnitude and opposite polarities. Symmetry Sensitivity Error, SymERR (%), is measured and defined as: SensBPOS SensBNEG 1– SymERR = ×100% , (13) where SensBx is as defined in equation 11, and BPOS and BNEG are positive and negative magnetic fields such that |BPOS| = |BNEG|. Note that the Symmetry Sensitivity Error specification is valid only for bipolar devices. Duty Cycle Jitter The duty cycle of the PWMOUT output may vary slightly over time despite the presence of a constant applied magnetic field and a constant Carrier Frequency, fPWM, for the PWMOUT signal. This phenomenon is known as jitter, and is defined as: JitterPWM = , 3 DBi ± 1 n n i=1 (14) where DB1,…,DBn are the sampled duty cycles in a constant applied magnetic field, B, measured over 1000 PWM clock peri- ods, and JitterPWM is given in % D. |
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